<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.26.3</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>201</ContextCount>
  <ElementCount>272</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>true</FootnotesReported>
  <SegmentCount>47</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>4</UnitCount>
  <MyReports>
    <Report instance="senea20261003_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>000 - Document - Document And Entity Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.senecafoods.com/20260926/role/statement-document-and-entity-information</Role>
      <ShortName>Document And Entity Information</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="senea20261003_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>001 - Statement - Condensed Consolidated Balance Sheets (Current Period Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.senecafoods.com/20260926/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited</Role>
      <ShortName>Condensed Consolidated Balance Sheets (Current Period Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="senea20261003_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>002 - Statement - Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.senecafoods.com/20260926/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited-parentheticals</Role>
      <ShortName>Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="senea20261003_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>003 - Statement - Condensed Consolidated Statements of Net Earnings (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.senecafoods.com/20260926/role/statement-condensed-consolidated-statements-of-net-earnings-unaudited</Role>
      <ShortName>Condensed Consolidated Statements of Net Earnings (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="senea20261003_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>004 - Statement - Condensed Consolidated Statements of Comprehensive Income (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.senecafoods.com/20260926/role/statement-condensed-consolidated-statements-of-comprehensive-income-unaudited</Role>
      <ShortName>Condensed Consolidated Statements of Comprehensive Income (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="senea20261003_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>005 - Statement - Condensed Consolidated Statements of Cash Flows (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.senecafoods.com/20260926/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited</Role>
      <ShortName>Condensed Consolidated Statements of Cash Flows (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="senea20261003_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>006 - Statement - Condensed Consolidated Statements of Stockholders' Equity (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.senecafoods.com/20260926/role/statement-condensed-consolidated-statements-of-stockholders-equity-unaudited</Role>
      <ShortName>Condensed Consolidated Statements of Stockholders' Equity (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="senea20261003_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>007 - Disclosure - Note 1 - Basis of Preparation and Presentation</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.senecafoods.com/20260926/role/statement-note-1-basis-of-preparation-and-presentation-</Role>
      <ShortName>Note 1 - Basis of Preparation and Presentation</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="senea20261003_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>008 - Disclosure - Note 2 - Revenue Recognition</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.senecafoods.com/20260926/role/statement-note-2-revenue-recognition-</Role>
      <ShortName>Note 2 - Revenue Recognition</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="senea20261003_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>009 - Disclosure - Note 3 - Earnings Per Common Share</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.senecafoods.com/20260926/role/statement-note-3-earnings-per-common-share</Role>
      <ShortName>Note 3 - Earnings Per Common Share</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="senea20261003_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>010 - Disclosure - Note 4 - Inventories</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.senecafoods.com/20260926/role/statement-note-4-inventories</Role>
      <ShortName>Note 4 - Inventories</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="senea20261003_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>011 - Disclosure - Note 5 - Property, Plant and Equipment</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.senecafoods.com/20260926/role/statement-note-5-property-plant-and-equipment</Role>
      <ShortName>Note 5 - Property, Plant and Equipment</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="senea20261003_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>012 - Disclosure - Note 6 - Debt</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.senecafoods.com/20260926/role/statement-note-6-debt</Role>
      <ShortName>Note 6 - Debt</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="senea20261003_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>013 - Disclosure - Note 7 - Leases</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.senecafoods.com/20260926/role/statement-note-7-leases</Role>
      <ShortName>Note 7 - Leases</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="senea20261003_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>014 - Disclosure - Note 8 - Income Taxes</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.senecafoods.com/20260926/role/statement-note-8-income-taxes</Role>
      <ShortName>Note 8 - Income Taxes</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="senea20261003_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>015 - Disclosure - Note 9 - Receivables Purchase Program</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.senecafoods.com/20260926/role/statement-note-9-receivables-purchase-program</Role>
      <ShortName>Note 9 - Receivables Purchase Program</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="senea20261003_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>016 - Disclosure - Note 10 - Retirement Plans</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.senecafoods.com/20260926/role/statement-note-10-retirement-plans</Role>
      <ShortName>Note 10 - Retirement Plans</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="senea20261003_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>017 - Disclosure - Note 11 - Stockholders' Equity</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.senecafoods.com/20260926/role/statement-note-11-stockholders-equity</Role>
      <ShortName>Note 11 - Stockholders' Equity</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="senea20261003_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>018 - Disclosure - Note 12 - Fair Value of Financial Instruments</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.senecafoods.com/20260926/role/statement-note-12-fair-value-of-financial-instruments</Role>
      <ShortName>Note 12 - Fair Value of Financial Instruments</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="senea20261003_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>019 - Disclosure - Note 13 - Segment Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.senecafoods.com/20260926/role/statement-note-13-segment-information</Role>
      <ShortName>Note 13 - Segment Information</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="senea20261003_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>020 - Disclosure - Note 14 - Legal Proceedings, Other Contingencies, and Commitments</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.senecafoods.com/20260926/role/statement-note-14-legal-proceedings-other-contingencies-and-commitments</Role>
      <ShortName>Note 14 - Legal Proceedings, Other Contingencies, and Commitments</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="senea20261003_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>995445 - Disclosure - Insider Trading Arrangements</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/ecd/role/InsiderTradingArrangements</Role>
      <ShortName>Insider Trading Arrangements</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>22</Position>
    </Report>
    <Report instance="senea20261003_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>995445 - Disclosure - Significant Accounting Policies (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.senecafoods.com/20260926/role/statement-significant-accounting-policies-policies</Role>
      <ShortName>Significant Accounting Policies (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <Position>23</Position>
    </Report>
    <Report instance="senea20261003_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>995446 - Disclosure - Note 2 - Revenue Recognition (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.senecafoods.com/20260926/role/statement-note-2-revenue-recognition-tables</Role>
      <ShortName>Note 2 - Revenue Recognition (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.senecafoods.com/20260926/role/statement-note-2-revenue-recognition-</ParentRole>
      <Position>24</Position>
    </Report>
    <Report instance="senea20261003_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>995447 - Disclosure - Note 3 - Earnings Per Common Share (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.senecafoods.com/20260926/role/statement-note-3-earnings-per-common-share-tables</Role>
      <ShortName>Note 3 - Earnings Per Common Share (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.senecafoods.com/20260926/role/statement-note-3-earnings-per-common-share</ParentRole>
      <Position>25</Position>
    </Report>
    <Report instance="senea20261003_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>995448 - Disclosure - Note 4 - Inventories (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.senecafoods.com/20260926/role/statement-note-4-inventories-tables</Role>
      <ShortName>Note 4 - Inventories (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.senecafoods.com/20260926/role/statement-note-4-inventories</ParentRole>
      <Position>26</Position>
    </Report>
    <Report instance="senea20261003_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>995449 - Disclosure - Note 5 - Property, Plant and Equipment (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.senecafoods.com/20260926/role/statement-note-5-property-plant-and-equipment-tables</Role>
      <ShortName>Note 5 - Property, Plant and Equipment (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.senecafoods.com/20260926/role/statement-note-5-property-plant-and-equipment</ParentRole>
      <Position>27</Position>
    </Report>
    <Report instance="senea20261003_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>995450 - Disclosure - Note 6 - Debt (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.senecafoods.com/20260926/role/statement-note-6-debt-tables</Role>
      <ShortName>Note 6 - Debt (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.senecafoods.com/20260926/role/statement-note-6-debt</ParentRole>
      <Position>28</Position>
    </Report>
    <Report instance="senea20261003_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>995451 - Disclosure - Note 7 - Leases (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.senecafoods.com/20260926/role/statement-note-7-leases-tables</Role>
      <ShortName>Note 7 - Leases (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.senecafoods.com/20260926/role/statement-note-7-leases</ParentRole>
      <Position>29</Position>
    </Report>
    <Report instance="senea20261003_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>995452 - Disclosure - Note 10 - Retirement Plans (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.senecafoods.com/20260926/role/statement-note-10-retirement-plans-tables</Role>
      <ShortName>Note 10 - Retirement Plans (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.senecafoods.com/20260926/role/statement-note-10-retirement-plans</ParentRole>
      <Position>30</Position>
    </Report>
    <Report instance="senea20261003_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>995453 - Disclosure - Note 12 - Fair Value of Financial Instruments (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.senecafoods.com/20260926/role/statement-note-12-fair-value-of-financial-instruments-tables</Role>
      <ShortName>Note 12 - Fair Value of Financial Instruments (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.senecafoods.com/20260926/role/statement-note-12-fair-value-of-financial-instruments</ParentRole>
      <Position>31</Position>
    </Report>
    <Report instance="senea20261003_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>995454 - Disclosure - Note 13 - Segment Information (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.senecafoods.com/20260926/role/statement-note-13-segment-information-tables</Role>
      <ShortName>Note 13 - Segment Information (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.senecafoods.com/20260926/role/statement-note-13-segment-information</ParentRole>
      <Position>32</Position>
    </Report>
    <Report instance="senea20261003_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>995455 - Disclosure - Note 1 - Basis of Preparation and Presentation (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.senecafoods.com/20260926/role/statement-note-1-basis-of-preparation-and-presentation-details-textual</Role>
      <ShortName>Note 1 - Basis of Preparation and Presentation (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.senecafoods.com/20260926/role/statement-note-1-basis-of-preparation-and-presentation-</ParentRole>
      <Position>33</Position>
    </Report>
    <Report instance="senea20261003_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>995456 - Disclosure - Note 2 - Revenue Recognition (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.senecafoods.com/20260926/role/statement-note-2-revenue-recognition-details-textual</Role>
      <ShortName>Note 2 - Revenue Recognition (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.senecafoods.com/20260926/role/statement-note-2-revenue-recognition-tables</ParentRole>
      <Position>34</Position>
    </Report>
    <Report instance="senea20261003_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>995457 - Disclosure - Note 2 - Revenue Recognition - Segment Revenue Disaggregated by Product Category Groups (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.senecafoods.com/20260926/role/statement-note-2-revenue-recognition-segment-revenue-disaggregated-by-product-category-groups-details</Role>
      <ShortName>Note 2 - Revenue Recognition - Segment Revenue Disaggregated by Product Category Groups (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>35</Position>
    </Report>
    <Report instance="senea20261003_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>995458 - Disclosure - Note 2 - Revenue Recognition - Summary of Deferred Revenue Activity (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.senecafoods.com/20260926/role/statement-note-2-revenue-recognition-summary-of-deferred-revenue-activity-details</Role>
      <ShortName>Note 2 - Revenue Recognition - Summary of Deferred Revenue Activity (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>36</Position>
    </Report>
    <Report instance="senea20261003_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>995459 - Disclosure - Note 3 - Earnings Per Share - Earnings Per Common Share (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.senecafoods.com/20260926/role/statement-note-3-earnings-per-share-earnings-per-common-share-details</Role>
      <ShortName>Note 3 - Earnings Per Share - Earnings Per Common Share (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>37</Position>
    </Report>
    <Report instance="senea20261003_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>995460 - Disclosure - Note 4 - Inventories (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.senecafoods.com/20260926/role/statement-note-4-inventories-details-textual</Role>
      <ShortName>Note 4 - Inventories (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.senecafoods.com/20260926/role/statement-note-4-inventories-tables</ParentRole>
      <Position>38</Position>
    </Report>
    <Report instance="senea20261003_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>995461 - Disclosure - Note 4 - Inventories - Inventories by Category and Impact of Using LIFO Method (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.senecafoods.com/20260926/role/statement-note-4-inventories-inventories-by-category-and-impact-of-using-lifo-method-details</Role>
      <ShortName>Note 4 - Inventories - Inventories by Category and Impact of Using LIFO Method (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>39</Position>
    </Report>
    <Report instance="senea20261003_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>995462 - Disclosure - Note 5 - Property, Plant and Equipment (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.senecafoods.com/20260926/role/statement-note-5-property-plant-and-equipment-details-textual</Role>
      <ShortName>Note 5 - Property, Plant and Equipment (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.senecafoods.com/20260926/role/statement-note-5-property-plant-and-equipment-tables</ParentRole>
      <Position>40</Position>
    </Report>
    <Report instance="senea20261003_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>995463 - Disclosure - Note 5 - Property, Plant and Equipment - Property, Plant and Equipment (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.senecafoods.com/20260926/role/statement-note-5-property-plant-and-equipment-property-plant-and-equipment-details</Role>
      <ShortName>Note 5 - Property, Plant and Equipment - Property, Plant and Equipment (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>41</Position>
    </Report>
    <Report instance="senea20261003_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>995464 - Disclosure - Note 6 - Debt 1 (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.senecafoods.com/20260926/role/statement-note-6-debt-1-details-textual</Role>
      <ShortName>Note 6 - Debt 1 (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.senecafoods.com/20260926/role/statement-note-6-debt-tables</ParentRole>
      <Position>42</Position>
    </Report>
    <Report instance="senea20261003_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>995465 - Disclosure - Note 6 - Debt 2 (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.senecafoods.com/20260926/role/statement-note-6-debt-2-details-textual</Role>
      <ShortName>Note 6 - Debt 2 (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.senecafoods.com/20260926/role/statement-note-6-debt-tables</ParentRole>
      <Position>43</Position>
    </Report>
    <Report instance="senea20261003_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>995466 - Disclosure - Note 6 - Debt - Summary of Long-term Debt (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.senecafoods.com/20260926/role/statement-note-6-debt-summary-of-longterm-debt-details</Role>
      <ShortName>Note 6 - Debt - Summary of Long-term Debt (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>44</Position>
    </Report>
    <Report instance="senea20261003_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>995467 - Disclosure - Note 6 - Debt - Summary of Revolver Borrowings (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.senecafoods.com/20260926/role/statement-note-6-debt-summary-of-revolver-borrowings-details</Role>
      <ShortName>Note 6 - Debt - Summary of Revolver Borrowings (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>45</Position>
    </Report>
    <Report instance="senea20261003_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>995468 - Disclosure - Note 7 - Leases - Lease Expense (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.senecafoods.com/20260926/role/statement-note-7-leases-lease-expense-details</Role>
      <ShortName>Note 7 - Leases - Lease Expense (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>46</Position>
    </Report>
    <Report instance="senea20261003_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>995469 - Disclosure - Note 7 - Leases - Undiscounted Future Lease Payments Under Operating Leases and Financial Leases (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.senecafoods.com/20260926/role/statement-note-7-leases-undiscounted-future-lease-payments-under-operating-leases-and-financial-leases-details</Role>
      <ShortName>Note 7 - Leases - Undiscounted Future Lease Payments Under Operating Leases and Financial Leases (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>47</Position>
    </Report>
    <Report instance="senea20261003_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>995470 - Disclosure - Note 7 - Leases - Undiscounted Future Lease Payments Under Operating Leases and Financial Leases (Details) (Parentheticals)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.senecafoods.com/20260926/role/statement-note-7-leases-undiscounted-future-lease-payments-under-operating-leases-and-financial-leases-details-parentheticals</Role>
      <ShortName>Note 7 - Leases - Undiscounted Future Lease Payments Under Operating Leases and Financial Leases (Details) (Parentheticals)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>48</Position>
    </Report>
    <Report instance="senea20261003_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>995471 - Disclosure - Note 8 - Income Taxes (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.senecafoods.com/20260926/role/statement-note-8-income-taxes-details-textual</Role>
      <ShortName>Note 8 - Income Taxes (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.senecafoods.com/20260926/role/statement-note-8-income-taxes</ParentRole>
      <Position>49</Position>
    </Report>
    <Report instance="senea20261003_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>995472 - Disclosure - Note 9 - Receivables Purchase Program (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.senecafoods.com/20260926/role/statement-note-9-receivables-purchase-program-details-textual</Role>
      <ShortName>Note 9 - Receivables Purchase Program (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.senecafoods.com/20260926/role/statement-note-9-receivables-purchase-program</ParentRole>
      <Position>50</Position>
    </Report>
    <Report instance="senea20261003_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>995473 - Disclosure - Note 10 - Retirement Plans (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.senecafoods.com/20260926/role/statement-note-10-retirement-plans-details-textual</Role>
      <ShortName>Note 10 - Retirement Plans (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.senecafoods.com/20260926/role/statement-note-10-retirement-plans-tables</ParentRole>
      <Position>51</Position>
    </Report>
    <Report instance="senea20261003_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>995474 - Disclosure - Note 10 - Retirement Plans - Net Periodic Benefit Cost (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.senecafoods.com/20260926/role/statement-note-10-retirement-plans-net-periodic-benefit-cost-details</Role>
      <ShortName>Note 10 - Retirement Plans - Net Periodic Benefit Cost (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>52</Position>
    </Report>
    <Report instance="senea20261003_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>995475 - Disclosure - Note 11 - Stockholders' Equity (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.senecafoods.com/20260926/role/statement-note-11-stockholders-equity-details-textual</Role>
      <ShortName>Note 11 - Stockholders' Equity (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.senecafoods.com/20260926/role/statement-note-11-stockholders-equity</ParentRole>
      <Position>53</Position>
    </Report>
    <Report instance="senea20261003_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>995476 - Disclosure - Note 12 - Fair Value of Financial Instrument - Fair Value and Carrying Value of Long-term Debt (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.senecafoods.com/20260926/role/statement-note-12-fair-value-of-financial-instrument-fair-value-and-carrying-value-of-longterm-debt-details</Role>
      <ShortName>Note 12 - Fair Value of Financial Instrument - Fair Value and Carrying Value of Long-term Debt (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>54</Position>
    </Report>
    <Report instance="senea20261003_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>995477 - Disclosure - Note 13 - Segment Information (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.senecafoods.com/20260926/role/statement-note-13-segment-information-details-textual</Role>
      <ShortName>Note 13 - Segment Information (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.senecafoods.com/20260926/role/statement-note-13-segment-information-tables</ParentRole>
      <Position>55</Position>
    </Report>
    <Report instance="senea20261003_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>995478 - Disclosure - Note 13 - Segment Information - Segment Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.senecafoods.com/20260926/role/statement-note-13-segment-information-segment-information-details</Role>
      <ShortName>Note 13 - Segment Information - Segment Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>56</Position>
    </Report>
    <Report instance="senea20261003_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>995479 - Disclosure - Note 14 - Legal Proceedings, Other Contingencies, and Commitments (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.senecafoods.com/20260926/role/statement-note-14-legal-proceedings-other-contingencies-and-commitments-details-textual</Role>
      <ShortName>Note 14 - Legal Proceedings, Other Contingencies, and Commitments (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.senecafoods.com/20260926/role/statement-note-14-legal-proceedings-other-contingencies-and-commitments</ParentRole>
      <Position>57</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <InputFiles>
    <File>senea-20260926.xsd</File>
    <File>senea-20260926_cal.xml</File>
    <File>senea-20260926_def.xml</File>
    <File>senea-20260926_lab.xml</File>
    <File>senea-20260926_pre.xml</File>
    <File doctype="10-Q" isDefinitelyFs="true" isUsgaap="true" original="senea20261003_10q.htm">senea20261003_10q.htm</File>
  </InputFiles>
  <SupplementalFiles/>
  <BaseTaxonomies>
    <BaseTaxonomy items="996">http://fasb.org/us-gaap/2026</BaseTaxonomy>
    <BaseTaxonomy items="33">http://xbrl.sec.gov/dei/2026</BaseTaxonomy>
    <BaseTaxonomy items="5">http://xbrl.sec.gov/ecd/2026</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
